Spin defects in foils of hexagonal boron nitride have potential in quantum sensing applications. In this contribution we discuss recent optically detected magnetic resonance experiments with ensembles of negatively charged boron vacancies. Time resolved detection is used to determine the spin-dependent intersystem crossing rates and to measure the zero-field splitting of the optically excited state. Furthermore, a continuous dynamic decoupling protocol is used to stabilize Rabi-oscillations of the ground state spin, extending the coherence time up to 4 µs, an improvement of ~150 times.
We present our recent research on color centers in Aluminum Gallium Nitride which emit single photons up to room temperature. The mature processing technology which is available for group-III-nitrides and the host material’s optical transparency in the visible and infra-red opens up the possibility of novel applications in nanophotonics and quantum devices. We are working to create suspended photonic devices, including waveguides and photonic crystal cavities, which we will show can guide and enhance the color center emission.
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